Required Equipment

Measurement system

Soil Suitability

Long rods with large sensing volume (> 6 L) are suitable for soils with low to moderate electrical conductivity.

Sensing Volume（探测体积）

7800 cm3 (~7.5 cm radius around each probe rod and 4.5 cm beyond the end of the rods)

Electromagnetic

CE compliant (Meets EN61326 requirements for protection against electrostatic discharge and surge.)

Operating Temperature Range

-50° to +70°C

Sensor Output

SDI-12; serial RS-232

Warm-up Time

3 s

Measurement Time

3 ms to measure; 600 ms to complete SDI-12 command

Power Supply Requirements

6 to 18 Vdc (Must be able to supply 45 mA @ 12 Vdc.)

Maximum Cable Length

610 m (2000 ft) combined length for up to 25 sensors connected to the same data logger control port

Rod Spacing

32 mm (1.3 in.)

Ingress Protection Rating

IP68

Rod Diameter

3.2 mm (0.13 in.)

Rod Length

300 mm (11.8 in.)

Probe Head Dimensions

85 x 63 x 18 mm (3.3 x 2.5 x 0.7 in.)

Cable Weight

35 g per m (0.38 oz per ft)

Probe Weight

280 g (9.9 oz) without cable

Electrical Conductivity电导率

Range for Solution EC

0 to 3 dS/m

Range for Bulk EC

0 to 3 dS/m

Accuracy

±(5% of reading + 0.05 dS/m)

Precision

0.5% of BEC

Relative Dielectric Permittivity相对介电常数

Range

1 to 81

Accuracy 

· ±(2% of reading + 0.6) from 1 to 40 for solution EC ≤ 3 dS/m

· ±1.4 (from 40 to 81 for solution EC ≤ 1 dS/m)

Precision

< 0.02

Volumetric Water Content体积含水量

Range

0 to 100% (with M4 command)

Water Content Accuracy

· ±1% (with soil-specific calibration) where solution

· ±3% (typical with factory VWC model) where solution EC < 3 dS/m

Precision

< 0.05%

Soil Temperature

Range

-50° to +70°C

Resolution

0.001°C

Accuracy

· ±0.1°C (for typical soil temperatures [0 to 40°C] when probe body is buried in soil)

· ±0.5°C (for full temperature range)

Precision

±0.02°C